Malicious PDF — malware analysis report

Static analysis result for SHA-256 01bf73aa6aafc54b…

MALICIOUS

PDF

76.4 KB Created: 2020-12-02 08:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9c8b31fdf6be1d1b8f9111e9bd58e2da SHA-1: 1b497a5b058257ffe4184047b9cdc0c0b27471d3 SHA-256: 01bf73aa6aafc54b628e2e3821c7867f909647d7087ab8ebbd878d798ef29247
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to benign PDFs, but one prominent link points to a suspicious URL (https://trafficel.ru/strik?utm_term=pensamientos+cristianos+cortos+para+reflexionar). This behavior, combined with ClamAV and ML detections, strongly suggests a phishing or malware distribution attempt. The PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to hide malicious links among benign ones.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafficel.ru/strik?utm_term=pensamientos+cristianos+cortos+para+reflexionar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404299/normal_5f9f01bda437d.pdfIn PDF document text
    • https://dajifavetesa.weebly.com/uploads/1/3/4/2/134234726/gobikemagesagad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445101/normal_5f9e56cf2f694.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0d446ab79f442f2293e00/t/5fc4b01fe18c5c478e8fbcef/1606725664544/honeywell_th5110d1006_focuspro_5000_thermostat_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc655159955c744b5606702/t/5fc6c29c48d5672cfb2854e6/1606861468835/po-_boy_express_baton_rouge_louisiana.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd08482c6de34c7a3a6292/1606223947997/post_tension_slab_cost_per_square_foot_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4aff9ba-5e18-4532-b6a4-75f2bd3ce232/9507274194.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc287b9085bf90c0e078428/t/5fc714bb48d5672cfb36d08d/1606882491532/5939439652.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc19e291452f90b7fea6729/t/5fc3f531f3de5e49b5dee724/1606677811358/19538685851.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5bc03485235c86bdc245/1606376385258/avengers_infinity_war_google_drive.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe187418e72e5fdb9f1eb4/1606293630100/12872130747.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 5228 bytes
SHA-256: 0212f97b192233863a2cda1d7c03f05b68e007cbab37c704db538c7ba481b265
font_01_sfnt_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 11348 bytes
SHA-256: 93c460ff17bcb541c69a8e90b2011b94d5f2af3554163b92f06629f392209a1d

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